Defective Charger Spoiled Li-ion Battery In This SARIGAMA CARAVAN SC-03
This belonged to my school classmate and was brought to me with the complaint that there was no backup, though it worked very well. I have handled a similar set, a link of which is given below to avoid sharing another set of images, as the internal construction of both is same: https://jestineyong.com/saregama-caravan-sc-04-usb-fm-music-player-survived-floods/ I opened the set and found that the inside was very clean.
The battery had a built in charger. The outer blue layer should be peeled off to view the battery with its charger. Let us have a look.
The battery was almost dead. The charging was not taking place when checked connecting it to the board and the USB charger adaptor. Probably that is what caused a battery drain. I tried charging the battery externally using my Li-ion battery charger. It took charge but did not give necessary back-up.
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So, fetched a better rated cell and a similar charger PCB and bonded it using my recently acquired battery spot welder, which has a foot-switch to operate. I also provided the protective tapes on three sides as how it was on the original battery. (Now all these are available to buy):
The set was found working very well, which I ensured trying all its modes such as playing from internal storage of over 5000 songs, which can be selected artist-wise and type-wise (live classical, devotional etc.) from the front panel, FM Radio, USB and Bluetooth pairing.
Mission accomplished with satisfaction getting collected to the bag!
(Special note to keen observer expert: The battery was fully charged using its adaptor before giving delivery to the customer. The second pic above is taken before that!)
This article was prepared for you by Parasuraman Subramanian from India. He is 76 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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You may check on his previous article on Two Lovely Philips Radios Saved From Dump
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